Abstract Carbon materials with hierarchical nanostructures are well accepted propitious materials for electrode application in supercapacitor devices. Herein, a hierarchical ternary carbon aerogel structure is designed by integrating graphene (Gr),… Click to show full abstract
Abstract Carbon materials with hierarchical nanostructures are well accepted propitious materials for electrode application in supercapacitor devices. Herein, a hierarchical ternary carbon aerogel structure is designed by integrating graphene (Gr), carbon nanofibers (CNFs), and carbon nanotubes (CNTs). The as-synthesized CNTs@Gr-CNF materials are characterized by different analytical techniques for the electrode application in a supercapacitor. In the three-electrode system, CNTs@Gr-CNF electrode material exhibits an enhanced electrochemical performance in which a high specific capacitance of 521.5 F g−1 was obtained at 0.25 A g−1 along with the excellent capacitance retention of 98% after consecutive 10,000 charge-discharge cycles at 5 A g−1 in 6 M KOH. In addition, a hybrid supercapacitor device based on CNTs@Gr-CNF as the negative electrode and NiCo2S4 nanoneedle grown on nickel foam as the positive electrode was fabricated. The hybrid device shows 218 F g−1 of specific capacitance at 1 A g−1 and an energy density of 62.13 Wh Kg−1 at a power density of 789.66 W kg−1. Moreover, the device exhibits an excellent cyclic stability with the retention of 91.7% of its specific capacitance after 10,000 charge-discharge cycles. The obtained results signify that the CNTs@Gr-CNF material possesses highly desirable properties for negative electrode application in advanced hybrid supercapacitor.
               
Click one of the above tabs to view related content.